| Selective pallet rack | Capacity is determined by the rated beam-pair load, frame capacity, rack height, and the loads stored. Each pallet position is directly accessible. | Commonly made from formed steel upright frames and horizontal beams. Finish may be painted or powder-coated; coating choice should suit the operating environment. | High selectivity, but typically requires an aisle for each rack row. | Look for visible load-rating plaques, beam-locking devices, upright protection where exposed to vehicles, and properly anchored frames. | Warehouses storing many product types with frequent direct access to individual pallets. |
| Double-deep rack | Must be engineered for the combined stored loads and the deeper rack arrangement. Reach-truck access and load placement affect practical use. | Uses steel frames and beams similar to selective rack; deeper rows may require configuration-specific bracing and components. | Stores pallets two positions deep, reducing the number of aisles but limiting direct access to rear pallets. | Use equipment suitable for deep-lane access; compare load ratings, beam locks, anchorage, and protection at aisle ends. | Operations seeking greater storage density while retaining access to multiple product lines. |
| Push-back rack | Capacity depends on the engineered lane, number of pallet positions, cart design, and stored-load characteristics. Confirm the rating for the complete system. | Steel rack structure with nested carts and rails; moving components require inspection and maintenance. | Multiple pallets are stored in depth and accessed from the aisle, generally using a last-in, first-out flow. | Check cart stops, lane-end retention, rail condition, load-placement instructions, and clear operating procedures. | High-volume storage of several pallets per SKU where last-in, first-out rotation is acceptable. |
| Pallet-flow rack | System capacity and roller or wheel-track selection must account for pallet weight, dimensions, condition, and flow characteristics. | Steel rack structure with gravity-fed roller or wheel tracks; track components must be matched to the intended pallet and load. | Supports first-in, first-out rotation. Loading and picking typically occur from opposite ends of a lane. | Compare flow-control devices, lane separators, end stops, brakes or speed controllers where specified, and access for maintenance. | High-throughput applications needing FIFO rotation, such as dated or perishable inventory. |
| Drive-in / drive-through rack | Loads, bay geometry, entry conditions, and forklift impact exposure must be included in the rack design and capacity rating. | Heavy steel frames, rails, and bracing form deep storage lanes; inspect rail supports and structural connections. | High storage density with reduced aisle space. Drive-in commonly operates as last-in, first-out; drive-through can support access from both ends. | Consider upright and rail protection, entry guidance, clear load-placement rules, and routine inspection for impact damage. | Large quantities of similar products with relatively low SKU variety. |
| Structural pallet rack | May be specified for demanding loads or operating conditions, but capacity still depends on the engineered design, components, layout, and anchorage. | Uses heavier structural steel sections rather than only roll-formed rack members; exact steel specification varies by design. | Available in different layouts, including selective and high-density configurations; footprint and access depend on the chosen system. | Verify engineered drawings, component compatibility, connection details, anchorage, load plaques, and protection from vehicle impacts. | Applications requiring a rack system designed around heavy loads, specialized layouts, or demanding operating conditions. |